B-18 流れの可視化による燃料/空気同軸ノズルの混合性能改善(燃焼・燃焼器III,一般講演)

概要

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The Low NOx combustor for 25MW class gas turbine, which is composed of the burner with a lot of coaxial fuel/air nozzles, has been developed. This burner is named "Cluster Nozzle Burner". In this study, shape of single coaxial fuel/air nozzle was surveyed for mixing performance and pressure loss. Flow of fuel and air was modeled by water. Visualization tests of single coaxial jet were carried out by laser light sheet method for evaluating fuel/air mixing. Distributions of fuel concentration were imaged by detecting Mie scatter from tracer particles, which were mixed in simulated fuel. As a result of parameter survey, mixing performance was substantially improved by inserting fuel nozzle into air hole and adding a rib on fuel nozzle tip. Combining this nozzle shape with air hole whose entrance is tapered, good mixing performance is realized with lower pressure loss.
公益社団法人日本ガスタービン学会の論文
2006-10-01